一、被动语态的含义

　　英语中时态很多，但语态不多，只有两种，即：主动语态和被动语态。所谓“被动语态”，相当于中文中常说的“被……”、“由……”的句式，如：“他的自行车被偷了。”，“这座楼房是由他们建造的。”

　　二、被动语态的结构

　　那么，英语中被动语态是怎么样构成的呢?请看下面的例句(注意划线部分)：

　　His bicycle was stolen.

　　The building has been built in 2000.

　　通过上面的例句，可以看出，“被动语态”的构成是：

　　be + 过去分词 + (by+动作执行者)

　　三、被动语态的运用

　　什么情况下要用被动语态呢?一般地说，有下面几种情况：

　　(1) 不知道谁是动作的执行者或没有必要。例如：

　　Paper is made from wood. (纸是由木材生产出来的。)

　　The house is quite old. It was built in 1950. (这座房子太旧了。它是1950年建成的。)

　　He was wounded in the fight. (他在战斗在受伤了。)

　　Electricity is used to run machines. (电是用来开动机器的。)

　　(2) 需要强调动作的对象时。例如：

　　Calculator can t be used in the maths exam.

　　(计算器不能用于数学考试。)

　　Books and newspapers in the reading room mustnt be taken away. (阅览室的书籍和报纸不准带走。)

　　He was awarded first prize in that contest.

　　(他在比赛中获得了第一。)

　　(3)为了使语气婉转，避免提到是谁做的这件事。例如：

　　The construction of the new lab must be completed by the end of next month. (新实验室必须在下个月底前完工。)

　　四、各种时态的被动语态举例

　　一般地讲，被动语态可用于英语的各种时态。为了能准确地运用被动语态，重点是要掌握be动词的各种时态变化。各种时态的被动语态举例如下：

　　1、 一般现在时的被动语态. am / is / are + 动词的过去分词

　　Our classroom is cleaned every day.

　　This car is made in China.

　　2、一般过去式的被动语态: was / were + 动词的过去分词

　　His desk was cleaned just now.

　　The station was built in 1928.

　　3、现在进行时的被动语态: am / is / are + being + 动词的过去分词

　　A new factory is being built in our city now.

　　Some trees are being cut down in the park.

　　4、过去进行时的被动语态: was / were + being + 动词的过去分词

　　A new factory was being built in our city at that time.

　　Some babies were being looked after by Miss Chen last year.

　　5、一般将来时的被动语态:

　　(A) will / shall + be + 动词的过去分词

　　(B) am / is / are + going to be +动词的过去分词.

　　Some new factories will be built in our city this year.

　　Your watch is going to be mended in an hour.

　　6、过去将来时的被动语态: (1).would / should + be + 动词的过去分词 (2).was / were +going to be + 动词的过去分词.

　　She said that some new factories would be built soon in our city.

　　He thought that your watch was going to be mended after an hour.

　　7、现在完成时的被动语态:have / has + been + 动词的过去分词

　　Some new factories have been built in the city since last year.

　　Your watch has been mended already.

　　8、过去完成时的被动语态:had + been + 动词的过去分词

　　He said that some new factories had been built in the city.

　　I didn’t know that my watch had been mended .

　　9、含情态动词的被动式：can/may/must + be + done

　　例如：He can not be found. / I must be paid for this.